Lexus ES300 (1997 year). Service manual — part 357

W03870

FB–

(+)

RB+

FA+

FA–

RA+

FB+

RB–

RA–

(–)

–

DIAGNOSTICS

ELECTRIC MODULATED SUSPENSION

DI–205

357

1997 LEXUS ES300 (RM511U)

INSPECTION PROCEDURE

1

Check operation of absorber control actuator.

CHECK:
Using the same method as used for the clamping force control, check that clamping force of the absorber
control actuator changes.
OK:
Bounce the vehicle and check that the shock absorber is becoming harder.

OK

Proceed to next circuit inspection shown on
problem symptoms table (See page

DI–203

).

NG

2

Check continuity between terminals RB–, RB+, RA–, RA+, FB–, FB+, FA– and FA+
of absorber control ECU connector and body ground.

PREPARATION:
Remove the No.1 lower panel (See page

BO–82

).

CHECK:
Check continuity between terminals RB–, RB+, RA–, RA+,
FB–, FB+, FA–, and FA+ of absorber control ECU connector
and body ground.
OK:
Continuity

NG

Check and replace absorber control ECU

OK

W03871

Rear LH

RH

A11

Front LH

Front or Rear Absorber Control
Actuator

A35 RH

A12

A36

1

2

3

4

5

W03872

1

Absorber Control

Sub–wire Harness

Absorber Control Actuator

2

3

5

4

Actuator

1

2

3

4

5

DI–206

–

DIAGNOSTICS

ELECTRIC MODULATED SUSPENSION

358

1997 LEXUS ES300 (RM511U)

3

Check absorber control actuator.

PREPARATION:
Front absorber control actuator:
(a)

Remove the shock absorber cap (See page

SA–25

).

(b)

Remove the absorber control actuator connector.

Rear absorber control actuator:
(a)

Remove the rear seat cushion, rear seatback, roof side
inner garnish, high mounted stop light and seat belt.

(b)

Remove the absorber control actuator connector
(See page

SA–51

).

CHECK:
Measure resistance between each terminal of front or rear ab-
sorber control actuator.
OK:
Front absorber control actuator:

Terminal A11 or A12 – 1 and A11 or A12 – 2

12.4 – 13.6

Ω

Terminal A11 or A12 – 1 and A11 or A12 – 3

12.4 – 13.6

Ω

Terminal A11 or A12 – 1 and A11 or A12 – 4

12.4 – 13.6

Ω

Terminal A11 or A12 – 1 and A11 or A12 – 5

12.4 – 13.6

Ω

Rear absorber control actuator:

Terminal A35 or A36 – 1 and A35 or A36 – 2

12.4 – 13.6

Ω

Terminal A35 or A36 – 1 and A35 or A36 – 3

12.4 – 13.6

Ω

Terminal A35 or A36 – 1 and A35 or A36 – 4

12.4 – 13.6

Ω

Terminal A35 or A36 – 1 and A35 or A36 – 5

12.4 – 13.6

Ω

CHECK:
Front absorber control actuator:
Check continuity between each terminal of absorber control ac-
tuator and sub–wire harness.
OK:

Terminals 1 and 4

Continuity

Terminals 2 and 5

Continuity

Terminals 3 and 1

Continuity

Terminals 4 and 2

Continuity

Terminals 5 and 3

Continuity

NG

Replace absorber control actuator or absorber
control actuator sub–wire harness.

OK

–

DIAGNOSTICS

ELECTRIC MODULATED SUSPENSION

DI–207

359

1997 LEXUS ES300 (RM511U)

4

Check harness and connectors between absorber control ECU and absorber
control actuator, absorber control actuator and body ground (See page

IN–27

).

NG

Repair or replace harness or connector.

OK

Proceed to next circuit inspection shown on
problem symptoms table
(See page

DI–203

).*

*: However, when DTC 21 or 23 is displayed, check and replace absorber control ECU.

DI–208

–

DIAGNOSTICS

ELECTRIC MODULATED SUSPENSION

360

1997 LEXUS ES300 (RM511U)

DTC

31

Acceleration Sensor Circuit

CIRCUIT DESCRIPTION

DTC No.

DTC Detecting Condition

Trouble Area

31

Acceleration sensor signal malfunction.

Absorber control ECU

(Acceleration sensor is a built–in the equipment)

INSPECTION PROCEDURE

As the deceleration sensor is a built–in the equipment for absorber control ECU, replace them as a unit.

DI0AJ–01